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If I am to surface and overtake the convoy for a second attack what sort of range do I need between me and the convoy for them not to see me?
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If you look on your map, any time a vessel shows up, there are dashed circles around the ship when you click on it. These show the detection ranges. The big circle is the visual range. (The circle with the piece of pie missing is the ASDIC detection range) These ranges are in ideal conditions.
I usually end around at about 8-10km, depending on conditions.
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what is the best way to get their location without giving away my position as I believe the radar and hydrophone(misspelt?) give my location away, is this true?
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Hydrophone is a passive sensor and won't give your position away. If you have radar or sonar(late war), the enemy can(and will

) detect you.
Hydrophone can give you direction and an idea of distance but can get confusing with a lot of ships like a convoy. Visual observation will give you exact locations, but if you're deep and evading depth charges, perisope observations are not an option. You have to rely on hydrophones to get a general idea.
Nothing wrong with peeking on the surface using external camera when learning the game.